While performing "mouse wheel+CTRL" action the mouse pointer must be a center of the zoom. This point at workspace must not move from it's current positon. Like in Draw.io Look at this for the best practice.

When right mouse button is pressed user must be able to drag whole workspace. Like in Draw.io.
It's better to free righ button from copy/paste and other actions. Convenient scrolling is first, all another is second.
Ctrl+C, Ctrl+V and Ctrl+D forever!

Your program already got me, fix this non-working ***. I spent a few hours making a page, and now what? She's gone! Thanks to your clumsy programmers. This is not the first time, it stupidly does not save the work and the function "work offline" also does not work. You have no fucking work, no words.

Any wiki or cheatsheets implementing your tools and options such as zoom in/out, lock elements, etc. Complete waste of time, figuring out how to use your application. It hinders creating wireframes and very convoluted to use.